Effect of scan projection radiography coverage on tube current modulation in pediatric and adult chest CT |
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| Affiliation: | 1. University of Crete, Medical School, Department of Medical Physics, 71003 Heraklion, Crete, Greece;2. University Hospital of Heraklion, Department of Medical Physics, P.O. Box 1352, 71110 Heraklion, Crete, Greece;3. Brigham and Women''s Hospital, Dana-Farber Cancer Institute, Harvard Medical School;4. University of Crete, Medical School, Department of Radiology, Heraklion, Crete, Greece;1. Center for Surgical Outcomes Research and Center for Innovation in Pediatric Practice, Research Institute at Nationwide Children''s Hospital, Columbus, OH, USA;2. Department of Surgery, Nationwide Children''s Hospital, Columbus, OH, USA;3. Department of Radiology, Nationwide Children''s Hospital, Columbus, OH, USA;4. Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institute of Health, Bethesda, MD, USA;1. School of Health and Society, University of Salford, Salford, M5 4WT, United Kingdom;2. College of Applied Medical Sciences, Taibah University, Medina, 42353, Saudi Arabia;3. University of Applied Sciences Windesheim, Zwolle, Campus 2, 8017, CA, the Netherlands;4. School of Health Sciences (HESAV), HES-SO, University of Applied Sciences and Arts Western Switzerland, Av de Beaumont 21, 1011, Lausanne, Switzerland;5. Federal Institute of Santa Catarina Brazil, Av. Mauro Ramos, 950 - Centro, Florianópolis, SC, 88020-300, Brazil;6. Hanzehogeschool Groningen, University of Applied Sciences, Petrus Driessenstraat 3, Groningen, 9714, AS, the Netherlands;7. Central University of Technology, 20 President Brand Street, Bloemfontein, Free State, South Africa;1. Department of Physics, Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia;2. Division of Public Health, Johor State Health Department, 80100 Johor Bahru, Malaysia;3. Department of Radiology, Hospital Sultanah Aminah, Johor Bahru, 80100 Johor, Malaysia;4. Faculty of Health Sciences, Universiti Kebangsaan Malaysia, 56000 Kuala Lumpur, Malaysia;5. FRG Biomedical Engineering, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia;6. Department of Physics, University of Surrey, Guildford GU2 7XH, UK |
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| Abstract: | PurposeTo investigate the effect of scan projection radiography (SPR) coverage on tube current modulation in pediatric and adult thoracic CT examinations.MethodsSixty pediatric and 60 adult chest CT examinations were retrospectively studied to determine the incidence rate of examinations involving SPRs that did not include the entire image volume (IV) or the entire primarily exposed body volume (PEBV). The routine chest CT acquisition procedure on a modern 64-slice CT system was imitated on five anthropomorphic phantoms of different size. SPRs of varying length were successively acquired. The same IV was prescribed each time and the computed tube current modulation plan was recorded. The SPR boundaries were altered symmetrically by several steps of ±10 mm with respect to the IV boundaries.ResultsThe upper IV boundary was found to be excluded from SPR in 52% of pediatric and 40% adult chest CT examinations. The corresponding values for the lower boundary were 15% and 20%, respectively. The computed tube current modulation was found to be considerably affected when the SPR did not encompass the entire IV. SPR deficit of 3 cm was found to induce up to 46% increase in the computed tube current value to be applied during the first tube rotations over lung apex.ConclusionsThe tube current modulation mechanism functions properly only if the IV set by the operator is entirely included in the localizing SPR image. Operators should cautiously set the SPR boundaries to avoid partial exclusion of prescribed IV from SPRs and thus achieve optimum tube current modulation. |
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| Keywords: | Tube current modulation Scan projection radiography Helical CT Radiation exposure Patient safety TCM" },{" #name" :" keyword" ," $" :{" id" :" kw0035" }," $$" :[{" #name" :" text" ," _" :" tube current modulation AP" },{" #name" :" keyword" ," $" :{" id" :" kw0045" }," $$" :[{" #name" :" text" ," _" :" anteroposterior PA" },{" #name" :" keyword" ," $" :{" id" :" kw0055" }," $$" :[{" #name" :" text" ," _" :" posteroanterior LAT" },{" #name" :" keyword" ," $" :{" id" :" kw0065" }," $$" :[{" #name" :" text" ," _" :" lateral SPR" },{" #name" :" keyword" ," $" :{" id" :" kw0075" }," $$" :[{" #name" :" text" ," _" :" scan projection radiography IV" },{" #name" :" keyword" ," $" :{" id" :" kw0085" }," $$" :[{" #name" :" text" ," _" :" image volume PEBV" },{" #name" :" keyword" ," $" :{" id" :" kw0095" }," $$" :[{" #name" :" text" ," _" :" primarily exposed body volume OL" },{" #name" :" keyword" ," $" :{" id" :" kw0105" }," $$" :[{" #name" :" text" ," _" :" over-ranging length |
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